My research focuses on hydrological hazards associated with volcanic eruptions and landscape responses to large inputs of sediment, including from dam removals. Projects focus on: (1) identifying hydrogeomorphic processes altered by volcanic disturbance; (2) evaluating hydrogeomorphic consequences; and (3) quantifying characteristic hydrogeomorphic response times and durations.
Professional Experience
Scientist-in-Charge, USGS Cascades Volcano Observatory, 2021–present
Research hydrologist, USGS Cascades Volcano Observatory, 1997–2021
Hydrologist, USGS Cascades Volcano Observatory, 1993–1997
Geologist, USGS Cascades Volcano Observatory, 1984–1993
Hydrologic field assistant, technician, USGS Cascades Volcano Observatory, 1982–1984
Other professional service:
Panel member, GSA Quaternary Geology and Geomorphology (QG&G) Division, 2002-2004
Secretary, GSA QG&G Division, 2006-2012
Member, International Organizing Committee, International Debris Flow Hazards Mitigation Conferences (DFHM), 2008-2015
Chair, DFHM IOC, 2008-2012Chair, DFHM IOC, 2008-2012
Co-chair of local planning committee for IAVCEI 2017 Scientific Assembly, Portland,
Education and Certifications
University of Dayton, B.S., 1980, Geology
The Pennsylvania State University, M.S., 1984, Geology
University of Washington, Ph.D., 1996, Geology
Affiliations and Memberships
Geological Society of America
American Geophysical Union
International Association of Volcanology and Chemistry of Earth's Interior (IAVCEI)
American Avalanche Association (Member affiliate)
Editor:
Associate editor, Geological Society of America Bulletin, 2000-2011
Associate editor, Journal of Geophysical Research–Earth Surface, 2010-2014
Review editor, Frontiers in Volcanology, 2014 - Present
Co-editor, Geological Society of America Special Paper 375, Natural Hazards in El Salvador
Co-editor, Debris Flow Hazards Mitigation--Mechanics, Prediction, and Assessment: Proceedings of 4th International Conference on Debris Flow Hazards Mitigation (Millpress)
Chief guest editor, Andean Geology issue focused on the eruption of Chaitén Volcano (2013, v. 40(2))
Honors and Awards
Fellow, Geological Society of America (GSA)
E.B. Burwell Award, GSA, 1991
University of Dayton Alumni Special Achievement Award, 1999
Kirk Bryan Award, GSA, 2008
DOI Superior Service Award, 2018
Science and Products
Dam removal: synthesis of ecological and physical responses
My research publications can be parsed among various disciplinary studies. A full listing can be found on my Google Scholar profile (search for this via your web browser) and under the publications tab listing below. Publication topics include:
- Landslides, debris flows, and slurry rheology
- Volcanic eruptions and volcaniclastic processes (lahars, pyroclastic flows)
- Hydrogeomorphic responses to eruptions
- Geomorphic and ecologic responses to dam removals
- Photogrammetric analyses of eruptive processes
Lava effusion rate evolution and erupted volume during the 2018 Kīlauea lower East Rift Zone eruption
Effective hydrological events in an evolving mid‐latitude mountain river system following cataclysmic disturbance—A saga of multiple influences
Ten ways Mount St. Helens changed our world—The enduring legacy of the 1980 eruption
Lessons from a post-eruption landscape
A multidecade analysis of fluvial geomorphic evolution of the Spirit Lake blockage, Mount St. Helens, Washington
A multidecade analysis of fluvial geomorphic evolution of the Spirit Lake blockage, Mount St. Helens, Washington
Field trip guide to Mount St. Helens, Washington—Recent and ancient volcaniclastic processes and deposits
Toutle River debris flows initiated by atmospheric rivers: November 2006
Multidecadal geomorphic evolution of a profoundly disturbed gravel-bed river system—a complex, nonlinear response and its impact on sediment delivery
Conceptualizing ecological responses to dam removal: If you remove it, what's to come?
Science and Products
- Science
Dam removal: synthesis of ecological and physical responses
Dam decommissioning is rapidly emerging as an important river restoration strategy in the U.S., with several major removals recently completed or in progress. But few studies have evaluated the far-reaching consequences of these significant environmental perturbations, especially those resulting from removals of large (>10-15 m tall) structures during the last decade. In particular, interactions b - Publications
My research publications can be parsed among various disciplinary studies. A full listing can be found on my Google Scholar profile (search for this via your web browser) and under the publications tab listing below. Publication topics include:
- Landslides, debris flows, and slurry rheology
- Volcanic eruptions and volcaniclastic processes (lahars, pyroclastic flows)
- Hydrogeomorphic responses to eruptions
- Geomorphic and ecologic responses to dam removals
- Photogrammetric analyses of eruptive processes
Filter Total Items: 96Lava effusion rate evolution and erupted volume during the 2018 Kīlauea lower East Rift Zone eruption
The 2018 eruption on the lower East Rift Zone of Kīlauea Volcano produced one of the largest and most destructive lava flows in Hawai’i during the past 200 years. Over the course of more than 3 months, twenty-four fissures erupted, and the rate of lava effusion varied by two orders of magnitude, with significant implications for evolving flow behavior and hazards. Syn-eruptive data were collectedEffective hydrological events in an evolving mid‐latitude mountain river system following cataclysmic disturbance—A saga of multiple influences
Cataclysmic eruption of Mount St. Helens (USA) in 1980 reset 30 km of upper North Fork Toutle River (NFTR) valley to a zero‐state fluvial condition. Consequently, a new channel system evolved. Initially, a range of streamflows eroded channels (tens of meters incision, hundreds of meters widening) and transported immense sediment loads. Now, single, large‐magnitude or multiple moderate‐magnitude evTen ways Mount St. Helens changed our world—The enduring legacy of the 1980 eruption
Mount St. Helens was once enjoyed for its serene beauty and was considered one of America’s most majestic volcanoes because of its perfect cone shape, similar to Japan’s beloved Mount Fuji. Nearby residents assumed that the mountain was solid and enduring. That perception changed during the early spring of 1980. Then, on May 18, 1980, following 2 months of earthquakes and small explosions, the volLessons from a post-eruption landscape
From March to May 1980, magma rose high into Mount St. Helens (MSH), swelling and—as it turned out—destabilizing its north flank. Scientists knew the volcano had been highly active at times over the past 40,000 years, but the mountain, located amid the Cascade Range in southwestern Washington, had been mostly quiet since the mid-19th century. The collapse of the north flank on 18 May shattered thaA multidecade analysis of fluvial geomorphic evolution of the Spirit Lake blockage, Mount St. Helens, Washington
Volcanic eruptions can affect landscapes in many ways and consequently alter erosion and the fluxes of water and sediment. Hydrologic and geomorphic responses to volcanic disturbances are varied in both space and time, and, in some instances, can persist for decades to centuries. Understanding the broad context of how landscapes respond to eruptions can help inform how they may evolve, and therefoA multidecade analysis of fluvial geomorphic evolution of the Spirit Lake blockage, Mount St. Helens, Washington
Volcanic eruptions can affect landscapes in many ways and consequently alter erosion and the fluxes of water and sediment. Hydrologic and geomorphic responses to volcanic disturbances are varied in both space and time, and, in some instances, can persist for decades to centuries. Understanding the broad context of how landscapes respond to eruptions can help inform how they may evolve, and therefoField trip guide to Mount St. Helens, Washington—Recent and ancient volcaniclastic processes and deposits
This field guide explores volcanic effusions, sediments, and landforms at Mount St. Helens in Washington. A detailed synopsis outlines the eruptive history of Mount St. Helens from about 300,000 years ago through 1980 and beyond.The five days in the field include about 28 stops and 12 potential stops. Exposures in valleys surrounding Mount St. Helens reveal records of diverse Pleistocene and HolocToutle River debris flows initiated by atmospheric rivers: November 2006
In early November, 2006, an atmospheric river brought heavy rainfall and high freezing levels to the Pacific Northwest. Without snowpack to buffer the hydrologic response, the storm caused widespread landslides and debris flows in drainages sourced from every central Cascades volcano. At Mount St. Helens, in southwestern Washington State, intense rainfall in the crater of the volcano caused at leaMultidecadal geomorphic evolution of a profoundly disturbed gravel-bed river system—a complex, nonlinear response and its impact on sediment delivery
A 2.5-km3 debris avalanche during the 1980 eruption of Mount St. Helens reset the fluvial landscape of upper North Fork Toutle River valley. Since then, a new drainage network has formed and evolved. Cross-section surveys repeated over nearly 40 years at 16 locations along a 20-km reach of river valley document channel evolution, geomorphic processes, and their impacts on sediment delivery. We anaConceptualizing ecological responses to dam removal: If you remove it, what's to come?
One of the desired outcomes of dam decommissioning and removal is the recovery of aquatic and riparian ecosystems. To investigate this common objective, we synthesized information from empirical studies and ecological theory into conceptual models that depict key physical and biological links driving ecological responses to removing dams. We define models for three distinct spatial domains: upstreByEcosystems, Coastal and Marine Hazards and Resources Program, Fisheries Program, Arizona Water Science Center, Forest and Rangeland Ecosystem Science Center, Fort Collins Science Center, Geology, Minerals, Energy, and Geophysics Science Center, John Wesley Powell Center for Analysis and Synthesis, Oregon Water Science Center, Pacific Coastal and Marine Science Center, Western Fisheries Research Center - News